Can you write a macro in standard C that “returns” the greatest common divisor of a pair of arguments, without calling a subroutine? Why or why not? Experiment with naming rules in your favorite...

Can you write a macro in standard C that “returns” the greatest common divisor of a pair of arguments, without calling a subroutine? Why or why not? Experiment with naming rules in your favorite programming language. Read the manual, and write and compile some test programs. Does the language use lexical or dynamic scoping? Can scopes nest? Are they open or closed? Does the scope of a name encompass the entire block in which it is declared, or only the portion after the declaration? How does one declare mutually recursive types or subroutines? Can subroutines be passed as parameters, returned from functions, or stored in variables? If so, when are referencing environments bound?